Digital Item Declaration Language

Digital Item Declaration Language (DIDL) is an XML dialect standardized in MPEG-21. The schema files are available at MPEG.

Example

<did:DIDL xmlns:did="urn:mpeg:mpeg21:2002:02-DIDL-NS" xmlns:didmodel="urn:mpeg:mpeg21:2002:02-DIDMODEL-NS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <did:Item>
                <did:Descriptor>
                        <did:Statement mimeType="text/plain">Image item which two images</did:Statement>
                </did:Descriptor>
                <did:Descriptor>
                        <did:Component>
                                <did:Resource mimeType="image/png" ref="http://imagearchive.net/path/image.png"/>
                        </did:Component>
                </did:Descriptor>
                <did:Choice choice_id="choice1" minSelections="1" maxSelections="1" default="selection1">
                        <did:Descriptor>
                                <did:Statement mimeType="text/plain">Choice for selection of image 1 or 2. Digital items do not need to have choices.</did:Statement>
                        </did:Descriptor>
                        <did:Selection select_id="selection1">
                                <did:Descriptor>
                                        <did:Statement mimeType="text/plain">Selection 1</did:Statement>
                                </did:Descriptor>
                        </did:Selection>
                        <did:Selection select_id="selection2">
                                <did:Descriptor id="nodeDescriptor">
                                        <did:Statement mimeType="text/plain">Selection 2</did:Statement>
                                </did:Descriptor>
                        </did:Selection>
                </did:Choice>
                <did:Component>
                        <did:Condition require="selection1" />
                        <did:Descriptor>
                                <did:Statement mimeType="text/plain">Picture 1 text summary</did:Statement>
                        </did:Descriptor>
                        <did:Resource mimeType="plain/text">This is a plain text resource which is a text about picture 1</did:Resource>
                </did:Component>
                <did:Component>
                        <did:Condition require="selection1" />
                        <did:Descriptor>
                                <did:Statement mimeType="text/plain">Picture 1 text#1</did:Statement>
                        </did:Descriptor>
                        <did:Descriptor>
                                <!-- the statement also can contain XML -->
                                <did:Statement mimeType="text/plain">Picture 1 text#2</did:Statement>
                        </did:Descriptor>
                        <did:Resource mimeType="image/jpg" ref="http://picturedatabase.com/path/image1.jpg"/>
                        <did:Resource mimeType="image/jpg" ref="http://picturedatabasemirror.com/path/image1.jpg"/>
                </did:Component>
                <did:Component>
                        <did:Condition require="selection2" />
                        <did:Descriptor>
                                <did:Statement mimeType="text/plain">Picture 2 text summary</did:Statement>
                        </did:Descriptor>
                        <did:Resource mimeType="plain/text">This is a plain text resource which is a text about picture 2</did:Resource>
                </did:Component>
                <did:Component>
                        <did:Condition require="selection2" />
                        <did:Descriptor>
                                <!-- the statement also can contain XML -->
                                <did:Statement mimeType="text/plain">Picture 2 text#1</did:Statement>
                        </did:Descriptor>
                        <did:Descriptor>
                                <did:Statement mimeType="text/plain">Picture 2 text#2</did:Statement>
                        </did:Descriptor>
                        <did:Resource mimeType="image/jpg" ref="http://picturedatabase.com/path/image1.jpg"/>
                        <did:Resource mimeType="image/jpg" ref="http://picturedatabasemirror.com/path/image1.jpg"/>
                </did:Component>
        </did:Item>
</did:DIDL>